[Bug math/16407] ldbl-128ibm coshl spurious overflows

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http://sourceware.org/bugzilla/show_bug.cgi?id=16407

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=b821f414e480d7f9e097fa453b1c9bfd44d64316

commit b821f414e480d7f9e097fa453b1c9bfd44d64316
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Tue Jan 7 22:00:04 2014 +0000

    Fix ldbl-128ibm coshl spurious overflows (bug 16407).

    This patch fixes bug 16407, spurious overflows from ldbl-128ibm coshl.
    The implementation assumed that a high part (reinterpreted as an
    integer) of the absolute value of the argument of 0x408633ce8fb9f87dLL
    or more meant overflow, but the actual threshold has high part
    0x408633ce8fb9f87eLL (and a negative low part).  The patch adjusts the
    threshold accordingly.

    sinhl probably has the same issue, but I didn't get that far in adding
    tests of special cases (such as just below and above overflow) before
    the freeze and during the freeze is not a suitable time to add them
    (as they'd require ulps to be regenerated again), so I'm not changing
    that function for now; when I add more tests of special cases, we'll
    discover whether sinhl indeed has this problem.

    Tested powerpc32.

        * sysdeps/ieee754/ldbl-128ibm/e_coshl.c (__ieee754_coshl):
        Increase overflow threshold.

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Summary of changes:
 ChangeLog                             |    6 ++++++
 NEWS                                  |    2 +-
 sysdeps/ieee754/ldbl-128ibm/e_coshl.c |    2 +-
 3 files changed, 8 insertions(+), 2 deletions(-)

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